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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc280a8f188243cc67905c049c32391a2e73801029e13aacd0ae72cc0ea58f62' 
  AND token = 'vuHKaW3e6rN9IZqqdxQ0DajnZWSUE4d7OmaJxw4604s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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