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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0469f8332d83aa2ab3627c3ced424ae46bf0c67b74bbc74866a1a40f74678b3' 
  AND token = 'KpGFHsrqZK61g82bZXe7/XBeAZhHiMt2b7b6vqYeA3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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