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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5808d73d68c645394494d0551ab3462083ff2fa65a64c1c49fbb07da9ed66178' 
  AND token = 'J8mvQpeangtZEBqg1eTwF5v3RB/tQo2tvMe5zc4dnuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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