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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe92c6654c98bcd7433cc86e266194f1b605bf4f77cd091351a6f77ed1a8d1ca' 
  AND token = 'Bg6k2XfLv/1+jv/WC7gvycf/GS0yM6Ta6wWZdYuUXiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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