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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60971a864161e803bb0d3d681f9e5511da15c962e6bd56377d229941014d61f' 
  AND token = 'z7SNBORS2C9xelO8qSH1GjOtUGnu6hh83XUixz4yiy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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