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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9445cf5dbe3f2f7dcb66158a75106c447e10f10838d2020fd7b6bfaa5e546ee' 
  AND token = 'c17yNa5fSP4qL16V3RD4AylUO4LdYGOhMjrJAua5mPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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