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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1f3090a5d2cccdfe847b84a81c2cf72f631573c73dfa49dc7f0108eb4afc5c4' 
  AND token = 'HqMTnFeiaaPZ5sPLc7cA6cGn7lnxXiSuiXV3l+yKHzI=' 
  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"
    }
  }
}