Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4e5ed3ca3cd32e9258b0ed73c5f664f0765ff3f1a555a2093cf633379e4b78a' 
  AND token = 'U6uwu2eBKQSsZUa2BWvGi/8xozLNoRKdp06LUmJfpew=' 
  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"
    }
  }
}