SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3545f0216f7f3c8919bd32f71526996a5438fcad3a5902626a084303d48c9105' 
  AND token = 'w2SzpGR9oCCpDmAOEh8GpPs3Q+IQdbtRYz3JwTEljC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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