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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8171ada0f70d3446bf833d62a89da7d056f277d0592d94e251b053061b503610' 
  AND token = 'uDfRsNglE59Kln2xdJR4P9v2O08dJrKJEZOzExecu/o=' 
  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"
    }
  }
}