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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '023e138e0a3c8d1696a2b57e2f666acb83f535deaa3ea81be0e97e94d1e8d2bc' 
  AND token = 'UH8KAeJrdP5/txIz7lY0IBRAKUvxIgj8EBLhk6EcJCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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