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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '457f40c3bbbaeb37d74075f1b8653d4e43ec31351bba57cd5e7753bd5355f56c' 
  AND token = 'X0lmptW1I/nPiICJw2qu2fsdIm23+vIypk9XH/1pBnM=' 
  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"
    }
  }
}