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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f14dfe9cbcb1e4e346b3eaec67d1a50401b07425e832f89744f96f2efe9e639d' 
  AND token = '/CuaOH9CRvv5dBzDeGEVM8JlsQsdIvLb5NR5gSxQWYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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