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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '110950d63a4d424687ef9c24afc8c50f47b7d7dc5068dec5742bce63ac7e413c' 
  AND token = 'p8EaGx/v9PALEJ6rmPoufikR2Y9jGZ2xvCVAf2/pNyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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