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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e966c72976391b669d49b79e5088f490b54ac45d5942cd2a487a81c3508fdc1d' 
  AND token = 'y85Kgp8tqVXyyCefQdV+UlzABQzt6GIn8wToHp+O+94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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