SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f7bc5914d82530c59a0a2f94dc956b877c8919313d0b51394765bd63860b5c4' 
  AND token = 'SpSCVPhSKKj1T+upfgyh+zEh08KhPSSYw+dUDht7g0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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