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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab19619cb1c84689acf6c74eafc36d222187b0725e8d1d0f3c476a6abe82fa68' 
  AND token = '+aF1H4F8kwjZ/GtKfoGgGY/G/IOKoiCNYXmPGeA2Z7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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