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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9408cd1b629eeaa3363d1ab3bd95ac656a8ff44365143fa37ace27a08e82c6' 
  AND token = '5SY/wUJ8t4vMzj/oJERxDHELdttfD1e13ghOSyHF3OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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