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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be3a73f2fa63ffc945863d9fe2afb6575f73739a5703fd93d8fe33ed0e94dd12' 
  AND token = '0wEu0Nx4lfRIxU49Vyd5BsWQhYnpMXG6P1MrzuVvXDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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