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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b9c11de0a67f1a7958c53036e3312a1ed707067c65cae83416e08f14a5cd14' 
  AND token = 'wet6DZL3VFxALnkIsfpPectCrMgE8t0rDrwh2SzuvOk=' 
  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"
    }
  }
}