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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cab33eb8a974f6fc1bba72a4de308fe033931fdb0c97f6cff6827a7a9a7ce60' 
  AND token = 'CtOqT0+ZgVRc1qSX1MqV06f7nDorOu0DmE1Hs125n0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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