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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2766ab759cb4ce9bce73144a684e9bd6c8969975fc22566883d2022a76f6b328' 
  AND token = 'Ivf0eEFD4pvKfjHHFBAr3EE1dNc8EVwPU6lh9S/5WJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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