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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dde0c94c424ecddaa52d6973736426ff113a20b161d907892ce62889f8565c5f' 
  AND token = 'EFEm20I+cL0fJ48mj09kwDufAMV9VU9lt1YBKGu6kpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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