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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd105f489502a0f18fd176d42e738922c02b72c3cc23528400afc9e798afa41ae' 
  AND token = 'q5aCWRrEAi9ISdv+N4gVxCgUobCoJs8SHmA4jkmGXYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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