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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39b0c314b73442e3e83da01145d92b40e8c343c29ecba716146573857dee4698' 
  AND token = '2TAJ1hm4Q7u4LB5SRFSNRiquHpW54jYl9fNKhmRQJCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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