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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa0c42e8cec525b225bdc15559d4616062e8fb45db4040e905fb9a06fb79e51' 
  AND token = 'dIB6WH9K5UZcKizvP69Hh5G/0RfPDsV/fPJnWDS0oaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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