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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb4135b37e96ca4f048d724ad06e7ef868654151282ddad800d2017ad898b06' 
  AND token = '4x+sb7qTYvaP25Y630RBNYYTwFQeuF4zk3x0JY49a98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}