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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0fa5ca75eedc7f44fa05b34cbb9d0dd7572c29cbdb6dd1ade7cfda81f5f6f66' 
  AND token = 'cnZSevmoSRzA4AciZGgMvpUsUpqLPb5FptCl8xdbdm8=' 
  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"
    }
  }
}