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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6683c9a327c044b0e827df0c489f1a4b6f62e7812e4ee34d71d2bd5db886332e' 
  AND token = 'OioOnwpZdzqrjc4bQDkX/0laZqYytwaOdWiESnJ82Vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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