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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ff84cbd784619e0cbf25fff5cc2e3293af011339f09dd74b50e930ad8e09d47' 
  AND token = 'UVUuASJOrTR1BC47gniqzm4FFa8gSmN/ra7jfq3YGaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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