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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6280d3b65688c06d856a7a80d9995bbd8fb2f4d2c360879c50e67bed7c8d5cf' 
  AND token = '2W7qB95Ka5VD9nssdGRzzQxuC/iUbr95ZOxHQ9dz0IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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