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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f64b07c8ead00d7aa03b2d7f349219ed24ba58349c8d11bd6a8f4dc0b9363f86' 
  AND token = 'qR0DSUvYWFJ032728/1LFUeQtAqSJElMI80VBTjgZ6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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