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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6673ddd36bdb1ab2d461ad3859a84b9a6ee04a9f73c82a4fdc20653de5f4d563' 
  AND token = 'tY3h6EkUWoM5YDdI6Tt9gx422WlynOzenUaYpUa8uyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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