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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e99298dfb9c9568b3afaf4ce4a44a397645c4864e98e24ea5f139bf7c09a4b20' 
  AND token = 'ANxRI5gY9ULnITO8rw4sFc2FoXuph7E1mZ+/krhwYjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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