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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '254060a515398b70b8ae3947fb15de60484c1c65941b912a75b5e661345443e8' 
  AND token = 'aXF9hdjso1IlBzDhdgw1m6eA0GfRONO5s/QB/r3+cho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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