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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d30884aee728dbd135664d59904008675c3d9f5b7647ec6009971bee487ddd' 
  AND token = 'Zqxnr3gkCo0EIKFQWIgh2C5jyQROZ4D9jDGO2OZH994=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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