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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab0ed61dbeb28ee9a0056b738118c3823dcab94c0a3bac1ccaf666b17a331ace' 
  AND token = 'wBBZTx3RSAgI//Xo7e0htyaCzHwHD6z/gw20ji4diLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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