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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ecf6d7574d4662b87e6465f49caa54b46aadd512059b034e0ee33216923260b' 
  AND token = 'gw4GNJU5T8iKYpD5uSPBl6SJIgeNr8DCfQRxKA4FwB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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