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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b7c6b503684b5b6bf31a90d9db9d1f53bf222bd4d0fc4deb32d9fb3302fa31c' 
  AND token = 'KuI4UWSOhFPkV6lMS80jC73rgOsFIBa4N604qIl2umo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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