SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd65d2076210b3b261f3d9cb372c5f50d24dece804f30e2f6989c071ab4fb38b3' 
  AND token = 'cmAFxq/jjzaOPpIfAJiUdtTV2Mrsw7RHVJUUQD8KrnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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