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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04023721aa3e15d3a4853327d8e96c64ae159d917eaecb50b4fcf3cd256c50e3' 
  AND token = 'Voz9GocD3+/VehxmprKZ7CefCFfO3kJKiULrhFX0s+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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