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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b853285e4553243034df0c5a7707d9f1c97d485b10ec3899381038e3de7ad4' 
  AND token = 'L7ZoeYNHO06wQZMd6JNZnuhepwj3SMQ7Vwqtuf0Ibhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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