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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b4e8ed1a6a627fa73840b73753aad8e9a2c9c6583d9be45de6f58786501bbb' 
  AND token = 'lPhtYhjvoaUcX0yiml8DgW5SdvJvyfyK6ki17XDExiU=' 
  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"
    }
  }
}