SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbefbd58bf619c44ac5a7389581e65b0263d3417fc69c98aa2a57c002bc8e024' 
  AND token = '7KW6w+a5MH1hkM52AuA/hxezwkWRnvorZDXPGNBBuDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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