Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b770e4d11e4847cf9c6c2ee1eefdcf4df2b01d8218296530fa91644af697142f' 
  AND token = '1HIc+DUzYderXYJjU1BlgnSiPe+3T3wHY5tRAJOQQ84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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