SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14be3eba13c77b85adcb355f9e8c2af81976f1c9b4b86e677736206ab2370e1b' 
  AND token = '9ugPUrwVVDLu/voyZsIOmDhSduLF69UmBqf1K9y/jfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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