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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '255335a727d926458e0ccbac20f42d79b7a091d35fb3e54057c2059c460c86da' 
  AND token = 'Y2x1zmqdFpbdMqdSP9AM4oROpgr5mac9zy/mdQkrqxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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