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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec36a774a74a7455af9b83dab697c303f0c9c3e2490975fb9eb17bf9424aeb40' 
  AND token = '16q6YfDUHMO1gz5Bc3F6/AY8Q3VgjCiZ3pDTOtmfiTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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