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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17ba6ac951a75774b5705c2df6138730a1b89f66444b484a97759bb26ad1b537' 
  AND token = 's1rWmMbWa6vioudwH+4UJp5a7v7xnodq3gYF/hS8kvU=' 
  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"
    }
  }
}