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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f31e3d17a12364ce35a54c7e9a80d3e38f73092135bfcd49abb758a091d54586' 
  AND token = 'Q9gSUbtPpUGn8+7EhNg0BZ53fSdtduE4M0QcuMZSuAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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