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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff52db2573b9c891dbdc43d87c4d62718d06de0552ae7a64d4498dcee8802d40' 
  AND token = 'MSUnoga3nlElEoLEIzFUh90d0rICwVrZfWpKJl7n4vo=' 
  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"
    }
  }
}