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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb61012487d68d623ce911d204d841626f8434c6801c979dfc8d46ac4c75146' 
  AND token = '+etQo1JRiSk9GGRx38MLUT/p7UfcTOHKRX/i803+Kt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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