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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e9db8bf64bdb1bb78d727a6782d0fc0eb34400e1089d95c8776b35c4ac20fe' 
  AND token = 'akKzbpW8XpdXeWwlgdCV92Hi9YOy12FoXlVb+G71ulU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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