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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994be7f0766e7d7f987835d107cc325cbc5cc5ba1ee3d9cadd13b79a886c6754' 
  AND token = 's30iAd/l66B+yd+KTUamfGQ+RNxSdOdN2UYlsovXzMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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