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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d7bccf4473133ba429a6eb8b9aecbab239eb8dc0ccc85e8b98d8e17be4f781' 
  AND token = 'I458tdLaoE0KmfjzaS3HO7aaw2UCG2qq3UPSzN+eMRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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