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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cf11a3a7658bb5e3a8faae3f55c4653f5defe6252525f986bbdca635b3880f6' 
  AND token = 'JLQcgz8YDp7GW85W9AAGmv5Ohkn3SbwNfdc4WOR5zG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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