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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc03ab22f9cd88e29e586f88d33db1a1d7b3c71613c23dbb2daff4489d68ec8c' 
  AND token = 'k34T0AysKA/6QScEO7FOz6VhS3PgzNTbBNQtyyASlks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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