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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7330d3f38a11a2f985a89cd71065f71539d84bf477d248b4090b526d9a6bcc0' 
  AND token = 'r4eoyNs69AuoUnD0yelyLsoLbBDEPN+xx+bE3G6/6lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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