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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0136239579813e61c75cd20de1bc91d7dd98ac63d7bcf724b5b38ed228ac2e0c' 
  AND token = 'oyvBzpmf0IUWWqWH1SwF8jsM2fJCQxVmWp11ZN63f8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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