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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4ba8ab6068caa6ccb4804cf311ce54a2a70df31ca7da0ef587d4609797269b7' 
  AND token = 'NKvBYv4rBwycBU962TrZMBVCqM+eZM+jgW7i6KiyR1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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