Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7e3294fc190b8f8196504d50807e8fd47998a783f413225d0dfad0d1d4b2b86' 
  AND token = '8HEuJPiAOOldQ3EciTq/GtdCEWKunc1SgEx6lbi0kW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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